chapman



M. G. WHEEL ER & W. A. CHAPMAN. Mode of Plating Metals.

No. 234,736. Patented Nov. 23,1880.

N.FE\'ERS. PRDTQ-LITHGGRAPHER. WASHINGYON, D c,

MARSHALL G. WHEELER To all whom it may concern:

ass referred to can AND WILLIAM A. CHAPMAN, OF WINSTED, CONN.

MODE OF PLATING METALS.

Application filed February 28, 1880.

thin plate or s consists plates and the proces Be it known that we,MARSHALL G.WHEEL- 1n superimposing one metal upon another and ER and WM.A. CHAPMAN, ot' Winsted, in the applying pressure sufficient to make themetcounty of Litchfield and State of (/OHDGOEICLUI, als interpenetratethat is, to make parts of ;have invented a certain new and useful Imoneof the metals enter the pores of the otherprovementpertainingtoPlatingMetals, wheremetal. v20f the followin is adescription, reference be- The letter (t denotes a lower die, on whichfinghad to the accompanying diawings, which rests a suitable metallicbase, Z), in the presfare illustrative merely of the process and outcase Britannia metal with a silver-plated iproduct wherein our inventioncons1sts surface.

igure 1 being a side view of dies andstock The letter 0 denotes thesheet of metal of for putting our process in practice, and Fig. anothercolor, in the present case a piece of 72 being a face view of a productof the proso-called Dutch metal reduced to the thincess. ness of foil.

Our invention relates to the union of plates The letter d denotes theupper die, which is of gold, silver, and the softer metals and alto bemoved by appropriate means and be caloys of metals. pable of coming downupon the lower die with The state of the art of plating this class ofgreat power.

f metals and alloys one with another is, so far The corresponding facesof the dies may be ,[as'we know it, as follows: The oldestcommon plainor may be shaped and designed to pro- 75 method 0t platin or unitingthis class of metduce some ornamental figure in relief. In the als isthat used in making what is known as atter case the raised parts willnot be pressed f Sheffield plate, which consists in soldering or pinchedby the dies, and consequently the or brazing a sheet of gold or silveron a base superimposed metal will not appear thereon 2 of brass orthelike, and then rolling and formand will not adhere thereto. 8o

' ing the two to desired form and thickness The dies must close togetherunder great The present most common method of platin power. Where thesuiface covered with the metals isthe process known aselectroplatsuperimposed metal amounted to about two .ing. and one-halfsquare inches we have found one 30. It has also been proposed, we knownot hundred and twenty-five tons a good working with what measureot's'uccess, to unite metals ,pressure, using any of the ordinarythickby a process called sweating, which con- I nesses of foil on a baseof silverplated brisists in placing together plates of metal ofdiftannia. fering degrees of refractoriness and submit- In Fig. 2 weshow a product ofthis process 35 ting the plates toaheatsufficient tocause the a plate stamped in relief, the parts in solid 0 lessrefractory metal to fuse to the more reblack representing the raisedsurfaces on Lfractory. which the superii'nposed metal does not ad- {lthas also been proposed, we know not here.

with what measure of success, to heat the Wheie in the following claimwe mention 0 plates of metal which are to be united in an metals we meanthereby gold, silver, and the 5 air-tight metallic boX to a red heat,and then softer metals and alloys thereof. pass them through rolls or apowerful press- We claim as our invention a process which seems to beakm to the com The process of plating or uniting gold, silmon process ofweldin non and steel ver, and the softer metals and alloys thereof 5 orinvention consists in the discovery that without heat or electricity,consisting in sub- I00 plates of metal of the cl P under suitableconditions, be permanently united or plated one upon another without theuse of heat, solder, brazing, or electroplating, discovery of whatsuitable conditions are, and in the devising of process and means forcarrying the discovery into practical use (1 effect. The said conditionsare,

that one or both the metals shall be put into the form of a very jecting the metalsone of them reduced to the thinness of foil to a pressuresufficient to make the metals interpenetrate, substantially as sliownand described.

G. WHEELER. A. CHAPMAN.

